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Model and expecting mum Chrissy Teigen has got into the Christmas spirit early as she transforms into a sexy Santa while filming a Christmas episode of Lip-Sync Battle .

The 29-year-old pregnant star strips down to some silk negligee as she joins stars on the new programme, miming her heart out in a Santa hat and little else.

Showing just the hint of a bump, the star steps up to the microphone with confidence, risking a wardrobe malfunction as she presents the Christmas special.

Also stealing the spotlight on the show is actor Joseph Gordon-Levit who dresses up as Janet Jackson.

The star sings her heart out (Photo: Spike TV)

Chrissy stunned in the silk (Photo: Spike TV)

Funnyman Seth Rogen is a huge part of the show too as he dresses up as The Elf on the Shelf, before teaming up with Gordon-Levit to chronicle the hit rap group Run DMC - who themselves appear on stage later.

Actor Anthony Mackie also dresses to impress as he takes to the stage for his songs.

While it is Chrissy stealing the limelight, she joint hosts the show with LL Cool J.

That's quite the concentration face (Photo: Spike TV)

A first look at the show (Photo: Spike TV)

We know the model takes fancy dress seriously, as demonstrated with her Halloween choice.

The gorgeous model revealed her larger than life TV chef Guy Fieri costume for the occasion - and we were seriously impressed.

A fabulous presenter (Photo: Spike TV)

The beauty channelled the restaurateur for a spooky edition of FABLife.

The mum-to-be posted a hilarious video on Instagram in which she was doing her best Guy impression.